name: BM Bossbot

"on":
  workflow_run:
    workflows:
      - Tests
    types:
      - completed
  workflow_dispatch:
    inputs:
      pr_number:
        description: Pull request number to review
        required: true
  # Review-thread activity re-evaluates the approval status without re-running
  # the full LLM review: new feedback flips the gate to failure, resolving the
  # last thread restores a previously earned approval for the same head SHA.
  pull_request_review:
    types:
      - submitted
  pull_request_review_comment:
    types:
      - created
  pull_request_review_thread:
    types:
      - resolved
      - unresolved

permissions:
  contents: read
  pull-requests: write
  statuses: write
  issues: read

env:
  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
  BM_BOSSBOT_STATUS_CONTEXT: "BM Bossbot Approval"

jobs:
  review:
    name: BM Bossbot Review
    # Job-level concurrency (not workflow-level): thread-recheck events for the
    # same PR must never cancel an in-flight review run, and vice versa.
    concurrency:
      group: bm-bossbot-review-${{ github.event.workflow_run.pull_requests[0].number || inputs.pr_number }}
      cancel-in-progress: true
    if: |
      github.event_name == 'workflow_dispatch' ||
      (
        github.event_name == 'workflow_run' &&
        github.event.workflow_run.conclusion == 'success' &&
        github.event.workflow_run.pull_requests[0].number != ''
      )
    runs-on: ubuntu-latest
    outputs:
      pr_number: ${{ steps.pr.outputs.pr_number }}
      should_review: ${{ steps.pr.outputs.should_review }}

    steps:
      - name: Checkout trusted base ref
        uses: actions/checkout@v6
        with:
          ref: ${{ github.event.repository.default_branch }}
          fetch-depth: 1

      - name: Set up uv
        uses: astral-sh/setup-uv@v3

      - name: Normalize PR event
        id: pr
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail
          event_file="${RUNNER_TEMP}/bm-bossbot-event.json"
          should_review=true

          if [ "${GITHUB_EVENT_NAME}" = "workflow_dispatch" ]; then
            pr_number="${{ inputs.pr_number }}"
            tested_sha=""
          else
            pr_number="$(jq -r '.workflow_run.pull_requests[0].number // ""' "${GITHUB_EVENT_PATH}")"
            tested_sha="$(jq -r '.workflow_run.head_sha // ""' "${GITHUB_EVENT_PATH}")"
          fi

          gh api "repos/${GITHUB_REPOSITORY}/pulls/${pr_number}" > "${RUNNER_TEMP}/pull.json"
          current_head_sha="$(jq -r '.head.sha' "${RUNNER_TEMP}/pull.json")"
          draft="$(jq -r '.draft' "${RUNNER_TEMP}/pull.json")"

          if [ "${GITHUB_EVENT_NAME}" = "workflow_dispatch" ]; then
            tests_run_id="$(
              gh api -X GET "repos/${GITHUB_REPOSITORY}/actions/workflows/test.yml/runs" \
                -f event=push \
                -f head_sha="${current_head_sha}" \
                -f status=completed \
                --jq '[.workflow_runs[] | select(.conclusion == "success")][0].id // ""'
            )"
            if [ -z "${tests_run_id}" ]; then
              should_review=false
              echo "BM Bossbot skipped PR ${pr_number}: no successful Tests workflow for ${current_head_sha}."
            fi
          fi

          if [ "${draft}" = "true" ]; then
            should_review=false
            echo "BM Bossbot skipped PR ${pr_number}: draft pull request."
          fi

          if [ -n "${tested_sha}" ] && [ "${tested_sha}" != "${current_head_sha}" ]; then
            should_review=false
            echo "BM Bossbot skipped PR ${pr_number}: Tests passed for ${tested_sha}, but current head is ${current_head_sha}."
          fi

          jq --arg repo "${GITHUB_REPOSITORY}" \
            '{repository:{full_name:$repo}, pull_request:{number:.number,title:.title,body:(.body // ""),html_url:.html_url,head:{sha:.head.sha,ref:.head.ref},base:{ref:.base.ref,sha:.base.sha},author_association:.author_association,draft:.draft}}' \
            "${RUNNER_TEMP}/pull.json" > "${event_file}"

          echo "event_file=${event_file}" >> "${GITHUB_OUTPUT}"
          echo "pr_number=$(jq -r '.pull_request.number' "${event_file}")" >> "${GITHUB_OUTPUT}"
          echo "head_sha=$(jq -r '.pull_request.head.sha' "${event_file}")" >> "${GITHUB_OUTPUT}"
          echo "head_ref=$(jq -r '.pull_request.head.ref' "${event_file}")" >> "${GITHUB_OUTPUT}"
          echo "author_association=$(jq -r '.pull_request.author_association // ""' "${event_file}")" >> "${GITHUB_OUTPUT}"
          echo "tested_sha=${tested_sha}" >> "${GITHUB_OUTPUT}"
          echo "should_review=${should_review}" >> "${GITHUB_OUTPUT}"

      - name: Classify PR author
        id: trust
        if: steps.pr.outputs.should_review == 'true'
        env:
          AUTHOR_ASSOCIATION: ${{ steps.pr.outputs.author_association }}
        run: |
          set -euo pipefail
          case "${AUTHOR_ASSOCIATION}" in
            OWNER|MEMBER|COLLABORATOR)
              trusted_author=true
              ;;
            *)
              trusted_author=false
              ;;
          esac
          echo "trusted_author=${trusted_author}" >> "${GITHUB_OUTPUT}"
          echo "author_association=${AUTHOR_ASSOCIATION}" >> "${GITHUB_OUTPUT}"

      - name: Mark BM Bossbot approval pending
        if: steps.pr.outputs.should_review == 'true'
        env:
          GITHUB_TOKEN: ${{ github.token }}
        run: |
          uv run --script scripts/bm_bossbot_status.py pending \
            --event "${{ steps.pr.outputs.event_file }}" \
            --repo "${GITHUB_REPOSITORY}" \
            --run-url "${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}"

      - name: Finalize BM Bossbot approval
        if: always() && steps.pr.outputs.should_review == 'true'
        env:
          GITHUB_TOKEN: ${{ github.token }}
        run: |
          uv run --script scripts/bm_bossbot_status.py finalize \
            --event "${{ steps.pr.outputs.event_file }}" \
            --trusted "${{ steps.trust.outputs.trusted_author }}" \
            --repo "${GITHUB_REPOSITORY}" \
            --run-url "${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}"

  recheck:
    name: BM Bossbot Thread Recheck
    if: |
      github.event_name == 'pull_request_review' ||
      github.event_name == 'pull_request_review_comment' ||
      github.event_name == 'pull_request_review_thread'
    runs-on: ubuntu-latest
    # Job-level concurrency: collapse bursts of thread events for one PR while
    # staying isolated from the review job's group so neither cancels the other.
    concurrency:
      group: bm-bossbot-recheck-${{ github.event.pull_request.number }}
      cancel-in-progress: true
    steps:
      - name: Checkout trusted base ref
        uses: actions/checkout@v6
        with:
          ref: ${{ github.event.repository.default_branch }}
          fetch-depth: 1

      - name: Set up uv
        uses: astral-sh/setup-uv@v3

      - name: Re-evaluate approval from review-thread state
        env:
          GITHUB_TOKEN: ${{ github.token }}
        run: |
          uv run --script scripts/bm_bossbot_status.py recheck \
            --pr-number "${{ github.event.pull_request.number }}" \
            --repo "${GITHUB_REPOSITORY}" \
            --run-url "${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}"